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      1 /*
      2  * Copyright (C) 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.messagingservice;
     18 
     19 import android.content.Context;
     20 import android.content.SharedPreferences;
     21 
     22 import java.text.DateFormat;
     23 import java.text.SimpleDateFormat;
     24 import java.util.Date;
     25 
     26 /**
     27  * A simple logger that uses shared preferences to log messages, their reads
     28  * and replies. Don't use this in a real world application. This logger is only
     29  * used for displaying the messages in the text view.
     30  */
     31 class MessageLogger {
     32 
     33     private static final String PREF_MESSAGE = "MESSAGE_LOGGER";
     34     private static final DateFormat DATE_FORMAT = SimpleDateFormat.getDateTimeInstance();
     35     private static final String LINE_BREAKS = "\n\n";
     36 
     37     public static final String LOG_KEY = "message_data";
     38 
     39     public static void logMessage(Context context, String message) {
     40         SharedPreferences prefs = getPrefs(context);
     41         message = DATE_FORMAT.format(new Date(System.currentTimeMillis())) + ": " + message;
     42         prefs.edit()
     43                 .putString(LOG_KEY, prefs.getString(LOG_KEY, "") + LINE_BREAKS + message)
     44                 .apply();
     45     }
     46 
     47     public static SharedPreferences getPrefs(Context context) {
     48         return context.getSharedPreferences(PREF_MESSAGE, Context.MODE_PRIVATE);
     49     }
     50 
     51     public static String getAllMessages(Context context) {
     52         return getPrefs(context).getString(LOG_KEY, "");
     53     }
     54 
     55     public static void clear(Context context) {
     56         getPrefs(context).edit().remove(LOG_KEY).apply();
     57     }
     58 }
     59